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Process for increasing sulfur recovery rate in steel smelting

A technology of iron and steel smelting and sulfur element, which is applied in the technical field of improving the recovery rate of sulfur element in iron and steel smelting, which can solve the problems such as the reduction of sulfur element recovery rate, and achieve the effect of improving the utilization rate of sulfur and controlling the oxygen content

Inactive Publication Date: 2018-12-28
江阴市茂昌金属新材料科技有限公司
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Problems solved by technology

[0006] Excessive oxygen content in the existing iron and steel smelting process causes sulfur and some non-metallic elements to react with oxygen, resulting in some impurities and reducing the recovery rate of sulfur

Method used

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  • Process for increasing sulfur recovery rate in steel smelting

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Embodiment

[0021] Example: such as figure 1 Shown: a process for improving the recovery rate of sulfur element in iron and steel smelting, comprising the following steps:

[0022] 1) Desulfurization of molten iron: desulfurize the molten iron, and then enter the mixed iron furnace after desulfurization;

[0023] 2) Stirring in the iron mixing furnace: the molten iron is evenly stirred in the iron mixing furnace, and then enters the converter for smelting;

[0024] 3) Converter smelting: The converter smelts, deoxidizes, and bottom blows the molten iron, and then taps the steel.

[0025] In this embodiment, in step 2), the stirring is sufficient, the molten iron and impurities should be visibly separated, and the temperature of the molten iron in the mixing furnace is 1300°C. The purpose of sufficient stirring is to promote the separation of molten iron and impurities. The molten iron is separated from slag in the iron mixing furnace. The average temperature in the iron furnace should ...

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Abstract

The invention relates to the field of steel smelting production processes, in particular to a process for increasing sulfur recovery rate in steel smelting. The process comprises steps of molten irondesulphurization, metal mixer mixing and converter smelting. With the adoption of the converter steel making process, oxygen content can be controlled effectively by controlling carbon content and final temperature of a converter, and sulfur using rate is increased.

Description

technical field [0001] The invention relates to the field of iron and steel smelting production technology, in particular to a technology for improving the recovery rate of sulfur element in iron and steel smelting. Background technique [0002] Users have higher and higher requirements for the cleanliness of steel, so we must try our best to reduce the number and size of non-metallic inclusions in steel, especially for high-quality cold-rolled products. [0003] Sulfur is a non-metallic substance, and it is easy to react with oxygen in molten steel. To increase the recovery rate of sulfur, the oxygen content must be reduced first, and the oxygen activity in molten steel at the end of converter smelting and the (FeO+MnO) in slag must be controlled. content, because this is the source of inclusions in steel. [0004] In any case, the effect of oxygen on the properties of metals is harmful. Oxygen can embrittle metals through different mechanisms due to the different states o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/30C21C1/02C21C7/064
CPCC21C1/02C21C5/30C21C7/064
Inventor 张志坚张新坚
Owner 江阴市茂昌金属新材料科技有限公司
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